Hayward, California is 16 times larger than Bnei Brak.
Area: 7 km2 calculated
Bnei Brak is a city located on Israel's central Mediterranean coastal plain, just east of Tel Aviv, in the Dan metropolitan region and Tel Aviv District. Bnei Brak is a center of Ultra Orthodox Judaism. Bnei Brak covers an area of 709 hectares. Wikipedia
Area: 117 km2 calculated
Hayward is a city located in Alameda County, California in the East Bay subregion of the San Francisco Bay Area. With a population in 2014 of 149,392 Hayward is the sixth largest city in the Bay Area and the third largest in Alameda County. Wikipedia